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Fair value measurements - Assets Measured on a Nonrecurring Basis (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Estimated fair value      
Fair value measurements on a recurring basis      
Loans, net $ 5,376,133,000   $ 5,439,330,000
Estimated fair value | Level 1      
Fair value measurements on a recurring basis      
Loans, net 0   0
Estimated fair value | Level 2      
Fair value measurements on a recurring basis      
Loans, net 23,637,000   28,354,000
Estimated fair value | Level 3      
Fair value measurements on a recurring basis      
Loans, net 5,352,496,000   5,410,976,000
Fair value measurements on a nonrecurring basis | American Savings Bank (ASB)      
Fair value measurements on a recurring basis      
Adjustments to fair value of loans held for sale 0 $ 0  
Fair value measurements on a nonrecurring basis | Level 1      
Fair value measurements on a recurring basis      
Loans, net 0   0
Mortgage servicing rights 0   0
Fair value measurements on a nonrecurring basis | Level 2      
Fair value measurements on a recurring basis      
Loans, net 0   0
Mortgage servicing rights 0   0
Fair value measurements on a nonrecurring basis | Level 3      
Fair value measurements on a recurring basis      
Loans, net 69,000   387,000
Mortgage servicing rights 61,000   3,001,000
Fair value measurements on a nonrecurring basis | Estimated fair value      
Fair value measurements on a recurring basis      
Loans, net 69,000   387,000
Mortgage servicing rights $ 61,000   $ 3,001,000